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   1  <?php
   2  
   3  final class AphrontCursorPagerView extends AphrontView {
   4  
   5    private $afterID;
   6    private $beforeID;
   7  
   8    private $pageSize = 100;
   9  
  10    private $nextPageID;
  11    private $prevPageID;
  12    private $moreResults;
  13  
  14    private $uri;
  15  
  16    final public function setPageSize($page_size) {
  17      $this->pageSize = max(1, $page_size);
  18      return $this;
  19    }
  20  
  21    final public function getPageSize() {
  22      return $this->pageSize;
  23    }
  24  
  25    final public function setURI(PhutilURI $uri) {
  26      $this->uri = $uri;
  27      return $this;
  28    }
  29  
  30    final public function readFromRequest(AphrontRequest $request) {
  31      $this->uri = $request->getRequestURI();
  32      $this->afterID = $request->getStr('after');
  33      $this->beforeID = $request->getStr('before');
  34      return $this;
  35    }
  36  
  37    final public function setAfterID($after_id) {
  38      $this->afterID = $after_id;
  39      return $this;
  40    }
  41  
  42    final public function getAfterID() {
  43      return $this->afterID;
  44    }
  45  
  46    final public function setBeforeID($before_id) {
  47      $this->beforeID = $before_id;
  48      return $this;
  49    }
  50  
  51    final public function getBeforeID() {
  52      return $this->beforeID;
  53    }
  54  
  55    final public function setNextPageID($next_page_id) {
  56      $this->nextPageID = $next_page_id;
  57      return $this;
  58    }
  59  
  60    final public function getNextPageID() {
  61      return $this->nextPageID;
  62    }
  63  
  64    final public function setPrevPageID($prev_page_id) {
  65      $this->prevPageID = $prev_page_id;
  66      return $this;
  67    }
  68  
  69    final public function getPrevPageID() {
  70      return $this->prevPageID;
  71    }
  72  
  73    final public function sliceResults(array $results) {
  74      if (count($results) > $this->getPageSize()) {
  75        $offset = ($this->beforeID ? count($results) - $this->getPageSize() : 0);
  76        $results = array_slice($results, $offset, $this->getPageSize(), true);
  77        $this->moreResults = true;
  78      }
  79      return $results;
  80    }
  81  
  82    public function willShowPagingControls() {
  83      return $this->prevPageID ||
  84             $this->nextPageID ||
  85             $this->afterID ||
  86             ($this->beforeID && $this->moreResults);
  87    }
  88  
  89    public function getFirstPageURI() {
  90      if (!$this->uri) {
  91        throw new Exception(
  92          pht('You must call setURI() before you can call getFirstPageURI().'));
  93      }
  94  
  95      if (!$this->afterID && !($this->beforeID && $this->moreResults)) {
  96        return null;
  97      }
  98  
  99      return $this->uri
 100        ->alter('before', null)
 101        ->alter('after', null);
 102    }
 103  
 104    public function getPrevPageURI() {
 105      if (!$this->uri) {
 106        throw new Exception(
 107          pht('You must call setURI() before you can call getPrevPageURI().'));
 108      }
 109  
 110      if (!$this->prevPageID) {
 111        return null;
 112      }
 113  
 114      return $this->uri
 115        ->alter('after', null)
 116        ->alter('before', $this->prevPageID);
 117    }
 118  
 119    public function getNextPageURI() {
 120      if (!$this->uri) {
 121        throw new Exception(
 122          pht('You must call setURI() before you can call getNextPageURI().'));
 123      }
 124  
 125      if (!$this->nextPageID) {
 126        return null;
 127      }
 128  
 129      return $this->uri
 130        ->alter('after', $this->nextPageID)
 131        ->alter('before', null);
 132    }
 133  
 134    public function render() {
 135      if (!$this->uri) {
 136        throw new Exception(
 137          pht('You must call setURI() before you can call render().'));
 138      }
 139  
 140      $links = array();
 141  
 142      $first_uri = $this->getFirstPageURI();
 143      if ($first_uri) {
 144        $links[] = phutil_tag(
 145          'a',
 146          array(
 147            'href' => $first_uri,
 148          ),
 149          "\xC2\xAB ".pht('First'));
 150      }
 151  
 152      $prev_uri = $this->getPrevPageURI();
 153      if ($prev_uri) {
 154        $links[] = phutil_tag(
 155          'a',
 156          array(
 157            'href' => $prev_uri,
 158          ),
 159          "\xE2\x80\xB9 ".pht('Prev'));
 160      }
 161  
 162      $next_uri = $this->getNextPageURI();
 163      if ($next_uri) {
 164        $links[] = phutil_tag(
 165          'a',
 166          array(
 167            'href' => $next_uri,
 168          ),
 169          pht('Next')." \xE2\x80\xBA");
 170      }
 171  
 172      return phutil_tag(
 173        'div',
 174        array('class' => 'aphront-pager-view'),
 175        $links);
 176    }
 177  
 178  }